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JP2003125473

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DESCRIPTION JP2003125473
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
portable communication terminal such as a portable telephone or a receiver capable of making a
call without a cord by indoor radio, and in particular, using a piezoelectric body capable of
obtaining a large output as a sound source. The present invention relates to a housing vibration
piezoelectric actuator in which flat frequency characteristics can be obtained in a voice band by
attaching the resonance frequency thereof and using a structure that adds a weight that enables
sound pressure improvement at low frequencies.
[0002]
2. Description of the Related Art Heretofore, as a vibration generating device for incoming signals
and voice signals of mobile phones and the like, those using bone conduction type earphones or
ear speakers connected by wires from mobile phones have been reported. . Further, as a method
for converting an incoming signal and an audio signal into vibration, there are an
electromagnetic type and a piezoelectric type biological conduction actuator. Here, the
electromagnetic biological conduction actuator uses an electromagnetic drive unit, and has a
disadvantage that the efficiency of converting an electrical signal into vibration is low, and power
consumption becomes large. In addition, the configuration of the drive unit and the
communication signal transfer unit is complicated in electromagnetics, vibration leakage to the
outer cover is large, causing unnecessary vibration (noise), and there is a limit in reducing the
thickness in shape. is there. Furthermore, when the first resonance frequency of the vibration
actuator is designed to be 100 Hz to 800 Hz for the incoming signal, there arises a problem that
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the vibration level at the frequency of the audio signal is reduced.
[0003]
In contrast to the above-mentioned electromagnetic type, the conventional piezoelectric speaker
for a portable telephone is thin, but the outer diameter tends to be large. In addition, the
sensational vibration output characteristic as in the vibration mode was not present. In addition,
it is necessary to control the resonant frequency of the piezoelectric body, which increases the
number of manufacturing steps, which makes it difficult to reduce the manufacturing cost.
[0004]
Therefore, in view of the drawbacks of the conventional portable communication terminal using
the piezoelectric speaker as described above, the technical problem of the present invention is
thin, small in outer diameter, advantageous for cost reduction, and obtains a high sound pressure
level. It is an object of the present invention to provide a housing vibration piezoelectric actuator
which can perform vibration mode of bodily sensation vibration and a portable electronic device
using the same.
[0005]
[Means for Solving the Problems] In order to solve the above-mentioned problems, a piezoelectric
body is used for the drive portion, and the piezoelectric body and a ring-like elastic body around
the outer peripheral portion and a weight are integrated by an adhesive member. The first
resonance frequency of the drive unit can be reduced by integrating the substantially central
portion of the piezoelectric body and the housing by the fixing member, thereby reducing the
ringing tone in vibration mode. In the frequency range of 0.3 kHz to 3.4 kHz, which can be set in
the vicinity of 200 Hz, the housing is used as a vibration generating diaphragm, and the
resonance frequency of the housing (second Flat frequency characteristics can be obtained by
setting the resonance frequency) to a high frequency higher than the voice frequency range, and
setting the resonance frequency (third resonance frequency) of the piezoelectric element itself to
a frequency higher than the housing resonance frequency. It becomes possible.
[0006]
That is, according to the present invention, in a structure in which a vibration actuator is
mounted as a sound source in a casing of a mobile communication terminal or the like, a
piezoelectric body for converting an electric signal into vibration is used for a drive portion. A
central portion and the housing are integrated by a fixing member, and a ring-shaped elastic
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body is fixed to the outer peripheral portion of the piezoelectric body, and the elastic body and
the weight are fixed. A housing vibration piezoelectric actuator is obtained.
[0007]
Further, according to the present invention, the housing is used as a vibration generating
diaphragm, and flat frequency characteristics can be obtained by setting the resonance frequency
to a high frequency higher than the audio frequency range. A housing vibration piezoelectric
actuator is obtained.
[0008]
Further, according to the present invention, the piezoelectric body is characterized in that it is
configured by any one of a monomorph, a bimorph, and a multimorph having a through hole for
integration with the casing at a central portion. The casing vibration piezoelectric actuator can be
obtained.
[0009]
Further, according to the present invention, it is possible to obtain the housing vibration
piezoelectric actuator characterized in that the elastic body is a rubber-based elastic body.
[0010]
Further, according to the present invention, the fixing member is a portion where the central
portion is fixed and the stress is maximized, and a washer having an optimum diameter to be a
perfect node is used. The housing vibration piezoelectric actuator is obtained.
[0011]
Further, according to the present invention, there is provided the case oscillating piezoelectric
actuator according to claim 1, wherein the weight has a shape and a weight for determining a
first resonance frequency of the drive unit.
[0012]
Further, according to the present invention, it is possible to obtain the housing vibration
piezoelectric actuator wherein the first resonance frequency of the drive unit is 100 Hz to 400
Hz.
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[0013]
Further, according to the present invention, in a portable electronic device having a sound source
and a vibration actuator as a vibration source mounted on a housing such as a portable
electronic device and a portable communication terminal, the piezoelectric body is heavy through
an elastic body. The weight is fixed, the resonance frequency of the weight and the elastic body is
set as a first resonance frequency, the housing is used as a vibration plate of the vibration and
sound source generation unit, and the second resonance frequency which is the resonance
frequency is used. In the voice band or audio frequency, the vibration actuator uses a
piezoelectric body, the resonant frequency of the piezoelectric body itself is a third resonant
frequency, and the third resonant frequency is a higher frequency band than the second resonant
frequency. A portable electronic device is obtained, wherein the first resonance frequency is in a
frequency band lower than that of the second resonance frequency.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0015]
FIG. 1 is a front view of a housing vibration piezoelectric actuator according to a first
embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II of FIG. 1 showing the mounting case portion
of the case vibrating piezoelectric actuator of FIG.
3 is a cross-sectional view taken along the line III-III of FIG. 1 showing the mounting case portion
of the case vibrating piezoelectric actuator of FIG.
Further, FIG. 4 is an enlarged view of a mounting portion of the case vibration piezoelectric
actuator of FIG.
[0016]
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Referring to FIGS. 1 to 4, the housing vibration piezoelectric actuator 11 uses the piezoelectric
body 1 for converting an electric signal into vibration as the driving unit 10, and substantially the
center of the piezoelectric body 1 and the substantially center of the housing 21. Parts are
integrated by a fixing member.
The piezoelectric body 1 is disc-like, has a hole 1a penetrating substantially in the center, and
uses a monomorph, a bimorph, or a multimorph structure.
A ring-shaped elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1
by a double-sided tape, an adhesive or the like.
The weight 3 is fixed to the other side of the elastic body 2 by the same method, and the drive
unit 10 is configured.
[0017]
The through hole 1a of the central portion of the piezoelectric body 1 used for the drive unit 10
and the hole of the central portion of the housing 22 are fixed using a screw 4 or the like.
The vibration mode of the piezoelectric body 1 is a portion where the stress is maximized
because the central portion is fixed, and a washer 4 with an optimum diameter for becoming a
complete node there is used and fixed with a screw 5.
[0018]
The weight 3 of the drive unit 10 is selected in shape and weight in order to determine the first
resonance frequency of the drive unit 1.
The first resonance frequency of the drive unit 10 is used to transmit an incoming signal to the
housing 21. The frequency band recognized as the incoming signal is optimally 100 Hz to 400
Hz.
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The determination factor of the first resonance frequency of the drive unit 10 is not only the
piezoelectric body 1 and the elastic body 2 and the weight 3 but also the casing 21.
Further, since the frequency band of the audio signal is 0.3 kHz to 3.4 kHz, it is necessary to set
the resonance frequency of the case 21 used as a diaphragm to, for example, 500 Hz or more.
[0019]
The piezoelectric body 1 is used for the drive unit 10, the substantially central portion of the
piezoelectric body 1 and the substantially central portion of the housing 21 are integrated by a
fixing member, and the ring-shaped elastic body 2 is double-sided tape on the outer peripheral
portion of the piezoelectric body 1 Or, by the method in which the weight 3 is fixed to the other
of the elastic body 2 by the same method, the case vibrating piezoelectric actuator 11 such as a
mobile phone becomes possible.
As a result, the outer diameter of the conventional piezoelectric vibration actuator tends to be
large, and it is necessary to control the resonance frequency of the piezoelectric body, which
increases the number of manufacturing steps and eliminates the drawback that it is difficult to
reduce the manufacturing cost. It was done. Depending on the size, shape, material, and the like
of the telephone case, an anti-resonance frequency of the case itself may be generated to
interfere with the wide band frequency characteristics. In such a case, by additionally mounting a
piezoelectric speaker element and driving in parallel with the piezoelectric body, it is possible to
form a piezoelectric actuator unit which is not affected by anti-resonance of the housing.
[0020]
Further, the shape of the portion constituting the diaphragm of the housing 21 may be an oval,
an ellipse, a rectangle or the like in addition to a circle.
[0021]
Also, when mounting the case vibration piezoelectric actuator 11 on a mobile phone etc., for
example, it is heavy around and above the main vibration actuator so that the piezoelectric
element is not damaged or damaged due to a drop impact from 1.8 m. A stopper for protection
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should be provided to prevent the weight from moving too much.
The stopper may be added as a case of the vibration actuator, or a rib or the like may be
provided on the housing side of the mobile phone to be a stopper.
[0022]
FIG. 5 is a plan view of a housing vibration piezoelectric actuator according to a second
embodiment of the present invention. 6 is a front sectional view of the actuator of FIG. 7 is a
bottom view of the actuator of FIG. Furthermore, FIG. 8 is a cross-sectional view taken along the
line VIII-VIII in FIG.
[0023]
Referring to FIGS. 5 to 8, the housing vibration piezoelectric actuator 12 uses the piezoelectric
body 1 for converting an electric signal into vibration as the drive unit 10, and substantially the
center of the piezoelectric body 1 and the substantially center of the housing 22. Parts are
integrated by a fixing member. The piezoelectric body 1 is disc-like, has a hole 1a penetrating
substantially in the center, and uses a monomorph, a bimorph, or a multimorph structure. A ringshaped elastic body 2 is fixed to the outer peripheral portion of the piezoelectric body 1 by a
double-sided tape, an adhesive or the like. The weight 3 is fixed to the other side of the elastic
body 2 by the same method, and the drive unit 10 is configured.
[0024]
The through hole 1 a in the central portion of the piezoelectric body 1 used in the drive unit 10
and the hole in the central portion of the housing 22 are fixed using a screw 4 or the like. The
vibration mode of the piezoelectric body 1 is a portion where the stress is maximized because the
central portion is fixed, and a washer 4 with an optimum diameter for becoming a complete node
there is used and fixed with a screw 5.
[0025]
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The weight 3 of the drive unit 10 is selected in shape and weight in order to determine the first
resonance frequency of the drive unit 10. The first resonance frequency of the drive unit 10 is
used to transmit an incoming signal to the housing 21. The frequency band recognized as the
incoming signal is optimally 100 Hz to 400 Hz. The determination factor of the first resonance
frequency of the drive unit 10 is not only the piezoelectric body 1 and the elastic body 2 and the
weight 3 but also the housing 22. Further, since the frequency band of the audio signal is 0.3
kHz to 3.4 kHz, it is necessary to set the resonance frequency of the case 21 used as a diaphragm
to, for example, 500 Hz or more.
[0026]
As shown in FIGS. 7 and 8, the case vibration piezoelectric actuator includes a voice input unit
30, which comprises a microphone 31 and a base 33, and is adjacent to the drive unit 10 in the
case 22. The anti-vibration material 32 is adhered to the surface of the microphone 31 and the
upper surface other than the sound intake with an elastic adhesive. The bottom of the
microphone 31 is connected to the substrate 34, and is housed in the housing 22 via the support
member 24. A gap is provided at a contact portion of the housing 22 of the voice input unit 30
with the living body. The gap is provided to avoid mechanical interference with the housing
vibration piezoelectric actuator 12 due to bending of the operator's wrist. Further, as shown in
FIG. 5 and FIG. 6, attachment of the casing vibration piezoelectric actuator to the living body is
performed by four wires 24.
[0027]
The piezoelectric body 1 is used in the drive unit 10, the substantially central portion of the
piezoelectric body 1 and the substantially central portion of the housing 22 are integrated by a
fixing member, and the ring-shaped elastic body 2 is double-sided tape on the outer peripheral
portion of the piezoelectric body 1 Or, by the method in which the weight 3 is fixed to the other
of the elastic body 2 by the same method, the case vibrating piezoelectric actuator 12 such as a
mobile phone becomes possible. As a result, the outer diameter of the conventional piezoelectric
vibration actuator 12 tends to be large, and it is necessary to control the resonance frequency of
the piezoelectric body, which increases the number of manufacturing steps and makes it difficult
to reduce the manufacturing cost. It was canceled.
[0028]
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Depending on the size, shape, material, and the like of the telephone case, an anti-resonance
frequency of the case itself may be generated to interfere with the wide band frequency
characteristics. In such a case, a piezoelectric actuator unit that is not affected by anti-resonance
of the housing can be formed by additionally mounting the piezoelectric speaker elements and
driving in parallel.
[0029]
Further, the shape of the portion constituting the diaphragm of the housing 22 may be an ellipse,
an ellipse, a rectangle, or the like, in addition to a circle.
[0030]
In addition, when mounting a piezoelectric vibration actuator on a mobile phone etc., for
example, weights move around and up and down of this vibration actuator so that the
piezoelectric element is not damaged or damaged even from a drop impact from 1.8 m. It is good
to provide a stopper for protection so as not to be excessive.
The stopper may be added as a case of the vibration actuator, or a rib or the like may be
provided on the housing side of the mobile phone to be a stopper.
[0031]
As described above, according to the present invention, a housing is used in which the
piezoelectric body is used as the drive portion, the housing is connected to the housing
substantially at the center, and the weight is joined to the outer peripheral portion as the
interlayer. The realization of the body vibration piezoelectric actuator compensates for the
disadvantages of the conventional piezoelectric speaker and enables the reduction of the outer
diameter and the reduction of the manufacturing cost.
[0032]
Brief description of the drawings
[0033]
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1 is a front view of a housing vibration piezoelectric actuator according to a first embodiment of
the present invention.
[0034]
2 is a cross-sectional view taken along the line II-II of FIG. 1 showing the mounting housing
portion of the housing vibration piezoelectric actuator of FIG.
[0035]
3 is a cross-sectional view taken along the line III-III of FIG. 1 showing the mounting housing
portion of the housing vibration piezoelectric actuator of FIG.
[0036]
4 is an enlarged view of the mounting portion of the housing vibration piezoelectric actuator of
FIG.
[0037]
5 is a plan view of a housing vibration piezoelectric actuator according to a second embodiment
of the present invention.
[0038]
6 is a front sectional view of the actuator of FIG.
[0039]
7 is a bottom view of the actuator of FIG.
[0040]
8 is a cross-sectional view taken along the line VIII-VIII in FIG.
[0041]
Explanation of sign
[0042]
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Reference Signs List 1 piezoelectric body 1a hole 2 elastic body 3 weight 4 washer 5 screw 6
support spring 11, 12 housing vibration piezoelectric actuator 10 drive unit 21, 22 housing 24
support member 30 voice input unit 31 microphone 32 anti-vibration material 33 base 34
substrate
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